Another chance to see some of the world's observatories at work, visited by Patrick Moore for The Sky at Night. Neutrino Hunting
One mile below the Black Hills of Dakota lies a huge tank of cleaning fluid deep inside a gold mine - the world's strangest observatory. It is designed to collect neutrinos sent out by the sun. But what do we really know about the sun? Some of our long-cherished theories seem to be wrong. Patrick Moore visits this unusual observatory and talks to Dr Raymond Davis and Dr Keith Rowley about the results of their work. Producer FLETER MORPURGO (R)